1 /* Copyright (C) 1996-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
24 #include <wcsmbsload.h>
29 # define EILSEQ EINVAL
33 /* This is the private state used if PS is NULL. */
34 static mbstate_t state;
36 /* This is a non-standard function but it is very useful in the
37 implementation of stdio because we have to deal with unterminated
38 buffers. At most NWC wide character will be converted. */
40 __wcsnrtombs (dst, src, nwc, len, ps)
47 struct __gconv_step_data data;
48 const wchar_t *srcend;
51 struct __gconv_step *tomb;
52 const struct gconv_fcts *fcts;
54 /* Tell where we want the result. */
55 data.__invocation_counter = 0;
56 data.__internal_use = 1;
57 data.__flags = __GCONV_IS_LAST;
58 data.__statep = ps ?: &state;
62 srcend = *src + __wcsnlen (*src, nwc - 1) + 1;
64 /* Get the conversion functions. */
65 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
67 /* Get the structure with the function pointers. */
69 __gconv_fct fct = tomb->__fct;
71 if (tomb->__shlib_handle != NULL)
75 /* We have to handle DST == NULL special. */
79 unsigned char buf[256]; /* Just an arbitrary value. */
80 const unsigned char *inbuf = (const unsigned char *) *src;
83 temp_state = *data.__statep;
84 data.__statep = &temp_state;
87 data.__outbufend = buf + sizeof (buf);
93 status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
94 (const unsigned char *) srcend, NULL,
97 /* Count the number of bytes. */
98 result += data.__outbuf - buf;
100 while (status == __GCONV_FULL_OUTPUT);
102 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
103 && data.__outbuf[-1] == '\0')
104 /* Don't count the NUL character in. */
109 /* This code is based on the safe assumption that all internal
110 multi-byte encodings use the NUL byte only to mark the end
114 data.__outbuf = (unsigned char *) dst;
115 data.__outbufend = (unsigned char *) dst + len;
117 status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
118 (const unsigned char *) srcend, NULL,
121 /* Count the number of bytes. */
122 result = data.__outbuf - (unsigned char *) dst;
124 /* We have to determine whether the last character converted
125 is the NUL character. */
126 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
127 && data.__outbuf[-1] == '\0')
129 assert (data.__outbuf != (unsigned char *) dst);
130 assert (__mbsinit (data.__statep));
136 /* There must not be any problems with the conversion but illegal input
138 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
139 || status == __GCONV_ILLEGAL_INPUT
140 || status == __GCONV_INCOMPLETE_INPUT
141 || status == __GCONV_FULL_OUTPUT);
143 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
144 && status != __GCONV_EMPTY_INPUT)
146 result = (size_t) -1;
147 __set_errno (EILSEQ);
152 weak_alias (__wcsnrtombs, wcsnrtombs)